1. 提取abc面组（maya 导出面集）

nodel = list(hou.selectedNodes())
for node in nodel:
    geo = node.geometry()
    a = geo.primGroups()
    nodePos = node.position()

    x=-3
    for group in a:
        name=group.name()
        x+=3
        next_position = [ nodePos[0]+x,nodePos[1]-2]
        blastNode = node.createOutputNode('blast')
        blastNode.setPosition(next_position)
        blastNode.parm('group').set(name)
        blastNode.parm('negate').set(1)

2.fetch abc相机

    selectNodes = hou.selectedNodes()
    allNodes = []
    allNodeName = []
    for node in selectNodes:
        type = node.type()
        parent = node.parent()
        for child in parent.children():
            allNodes.append(child.name())
            #print(child)
    print(allNodes)    

    obj = hou.node("/obj/")
    if 'transfer' not in allNodes:
        Nullnode = obj.createNode('null', 'transfer')
        selectNodes[0].setInput(0,Nullnode,0)
    #Nullnode.setName('transfer')
    for abc in selectNodes:
        abcallnode = abc.allSubChildren()
        posx =abc.position()[0]
        posy = abc.position()[1]
        abc.moveToGoodPosition()
        for node in abcallnode:
            cameraname = node.type().name()
            if cameraname == "cam":
                node.setDisplayFlag(0)
                camera_path = node.path()
                cameraAspectPath = node.parm('aspect').path()
                cameraFocalPath = node.parm('focal').path()
                cameraAperture = node.parm('aperture').path()
                if 'fetch1' in allNodes:
                    hou.node('/obj/fetch1').destroy()

                fetchNode = obj.createNode('fetch')
                fetchNode.setDisplayFlag(0)
                fetchNode.setPosition([posx-3,posy+1])
                fetchNode.parm('fetchobjpath').set(camera_path)
                fetchNode.parm('useinputoffetched').set(1)
                if 'renderCam' in allNodes:
                    hou.node('/obj/renderCam').destroy()
                cameraNode = fetchNode.createOutputNode('cam')
                cameraNode.setName('renderCam')
                cameraNode.parm('near').set('0.0001')
                cameraNode.setParmExpressions({"aspect":'ch("%s")'% cameraAspectPath})
                cameraNode.setParmExpressions({"focal":'ch("%s")'% cameraFocalPath})
                cameraNode.setParmExpressions({"aperture":'ch("%s")'% cameraAperture})

3. 重置节点参数

import hou
selectnodes = hou.selectedNodes()
for node in selectnodes:
    for c in node.parms():
        a=c.name()
        node.parm(a).deleteAllKeyframes()
        node.parm(a).revertToDefaults()

4.选择要渲染的null节点

    sel = hou.selectedNodes()
    if len(sel)==1:
        curPath = sel[0].parent()
        objPath = sel[0].path()
        namePath = sel[0].name()
        pos = sel[0].position()
        path = curPath

        obj = hou.node("/obj")
        geoNode = obj.createNode("geo",namePath)
        geoNode.setColor(hou.Color(0.3,0.5,0.1))
        geoNode.parm("geo_velocityblur").set(1)

        nullNode = geoNode.createNode("null","Display")

        mkMergeNode = geoNode.createNode("object_merge")
        mkMergeNode.setPosition(pos)
        mkMergeNode.setName(sel[0].name()+"_merge")
        mkMergeNode.setColor(hou.Color(1,0.5,0.1))
        mkMergeNode.parm("xformtype").set(1)
        mkMergeNode.parm("objpath1").set(objPath)
        nullNode.setDisplayFlag(1)
        mkMergeNode.setRenderFlag(1)